NATURAL SCIENCES OP PHILADELPHIA. 



301 



An examination of the table will show that seven (all new) out of forty-two 

 species may as yet be considered as peculiar to Cape St. Lucas. Two land 

 birds and two water birds belong to the coast region of Western North America ; 

 two species are peculiar to the Lower Gila and Colorado, (Centurns uropygialis 

 and Colaptes chrysoides,) although both may be found in time as far east as 

 El Paso, i On the other hand, fourteen of the species occur in the region ex- 

 tending from the Gila to the lower Rio Grande, none of them found in 

 Upper California, although several stretch northward in the Rocky Mountain 



i If this large-billed bird be considered as distinct (M.pertinax) from the true Af. mexi- 

 canus, it will be entered only in the Cape column. 



2 Found in the extension of the mountains south-east into Mexico 



3 Extending northward as far as Fort Bridger. 



4 Confined to the southern end of this region ; at Fort Tejon. 



5 Found on the Pecos only in this region. 



1859.] 



